I am using Debian 7.2.0 Wheezy stable 64 Bit. I installed from the net after trying many different ways. I had problems configuring aps so installation was broken up manz times.

I solved it, now I have the following problem

The system freezes right after boot. If I am fast I can type my name and password but then freeze...
Freeze means I can still move the mouse but not click or anything else. I do have graphical errors not showing the password line and the name is not completely readable.
Further while booting I see like colorful stars on the black boot screen and sone single letters in the boot screen are colorful as well. <looks nice but scary

Please help me I do not want to use the OS starting with "W" anymore.

I am using a Dual Core processor Intel R D 3GH
gforce 9000 Driver VESA G71 Board p455h2

ManOutOfJail < quiet optimistic!

PS I can use Debian from Live CD which I do right now. It fails to load Gnome 3 however. version 3.4.2

I don't know much about X11 and GUIs on top of Linux, but these should be your first steps.

Has it ever worked? And if yes, are you aware of any changes?

If you are familiar with the command line, check the log file /var/log/Xorg.0.log, as well as the older logs Xorg.1.log and so on. Fatal errors are flagged with (EE), warnings with (WW). Search for errors first.

You can access this file either by logging in from a remote computer or by starting your system in non-graphical mode.

Are you using kde or gnome???
I had similar issues with kde. But gnome works fine.